Learning Wiki
Every big idea, made clear
Short, friendly explanations of 354 things children learn at school, from number bonds to photosynthesis. Each one has examples, a quick quiz and free practice.
- Explanations
- 354
- Quiz questions
- 1502
- Subjects
- 9
- Ages covered
- 3–18
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Popular questions
What is photosynthesis?
Photosynthesis is how green plants make their own food. They use energy from sunlight to turn carbon dioxide from the air and water from the soil into sugar, giving out oxygen.
What is a fraction?
A fraction is part of a whole that has been split into equal parts. In ¾, the bottom number says how many equal parts and the top says how many you have.
What are number bonds?
Number bonds are pairs of numbers that add up to a given total, like 3 and 7 making 10. Knowing them by heart makes adding and subtracting much faster.
What are times tables?
Times tables are lists of the multiplication facts for a number, such as 3 × 1 = 3 up to 3 × 12 = 36. Knowing them by heart speeds up almost all later maths.
What is a fronted adverbial?
A fronted adverbial is a word, phrase or clause at the start of a sentence that tells how, when, where or why, followed by a comma, as in Later that night, the owl hooted.
What is place value?
Place value means a digit's value depends on its position in a number. In 352, the 3 is worth 300, the 5 is worth 50 and the 2 is worth 2.
What is the water cycle?
The water cycle is the endless movement of water between the land, the sea and the sky. Water evaporates, condenses into clouds, falls as rain or snow and collects in rivers and oceans.
What is the solar system?
The solar system is the Sun and everything that orbits it, including eight planets, their moons, dwarf planets such as Pluto, asteroids and comets.
Everything
A to Z
354 entries
#
A
- Acceleration
- Acids and bases
- Active and passive voice
- Active recall
- Adaptation
- Adding and subtracting fractions
- Addition
- Adjectives
- Adverbs
- Africa
- Algebra
- Algorithm
- Alliteration
- Alphabet
- Amphibians
- Ancient China
- Ancient Egypt
- Ancient Greece
- Ancient Rome
- Angles
- Angles in parallel lines
- Antarctica
- Antonyms
- Apostrophes
- Area
- Area of a circle
- Area of a trapezium (trapezoid)
- Area of a triangle
- Arrays
- Artificial intelligence
- Asia
- Atoms
- Australia and Oceania
B
C
- Capacity
- Capital cities
- Capital letters
- Castles
- Cells
- Chemical reactions
- Circumference of a circle
- Clauses
- Climate
- Coding
- Commas
- Comparing fractions
- Comparing numbers
- Compass directions
- Completing the square
- Composite functions
- Compound interest and simple interest
- Conditional probability
- Conductors and insulators
- Congruent triangles
- Conjunctions
- Context clues
- Continents
- Coordinates
- Counting
- Countries
- Cube numbers and cube roots
- Cumulative frequency
D
E
F
G
H
I
K
L
M
N
O
P
- Paragraphs
- Parallel and perpendicular lines
- Parallel structure (parallelism)
- Parts of a circle
- Parts of a computer
- Parts of a plant
- Past tense
- PEEL paragraphs
- Percentages
- Perimeter
- Personification
- Perspective drawing
- Persuasive techniques
- Persuasive writing
- Phases of the Moon
- Phonics
- Photosynthesis
- Physical and chemical changes
- Pi (π)
- Pictograms
- Pie charts
- Place value
- Plate tectonics
- Plurals
- Polygons
- Powers and indices
- Prefixes
- Prepositions
- Present tense
- Pressure
- Primary and secondary colours
- Prime factorisation
- Prime numbers
- Probability
- Profit and loss
- Pronouns
- Proper nouns
- Pythagoras' theorem
Q
R
- Radioactivity
- Rainforests
- Rates of reaction
- Ratio
- Reciprocals
- Relative clauses
- Relative frequency
- Remainders
- Renewable energy
- Reported speech (direct and indirect speech)
- Reptiles
- Revision timetable
- Rhetorical devices (and ethos, pathos, logos)
- Rhyme
- Rhythm and beat
- Rivers
- Rocks
- Roman numerals
- Rotational symmetry
- Rounding
S
- Sample space
- Scientific notation
- Seasons
- Segmenting
- Semicolons and colons
- Sentences
- Separating mixtures
- Sequences
- Series and parallel circuits
- Shadows
- Silent letters
- Similar triangles
- Similes
- Simple machines
- Simplifying expressions
- Simplifying fractions
- Simultaneous equations (systems of equations)
- Skeleton
- Skin
- Slope (gradient)
- Solar and lunar eclipses
- Solids, liquids and gases
- Sound
- South America
- Space exploration
- Spaced repetition
- Speed, distance and time
- Square numbers
- Square roots
- Stars
- Static electricity
- Stone Age
- Stopping distance
- Subject-verb agreement
- Subordinate clauses
- Subtraction
- Suffixes
- Summarising
- Surds (radicals)
- Surface area
- Syllables
- Symmetry
- Synonyms
T
- Tally charts
- Teeth
- Telling the time
- Temperature conversion (Celsius, Fahrenheit, Kelvin)
- The 24-hour clock
- The Amazon River
- The Arctic and Antarctic
- The binomial distribution
- The brain
- The colour wheel
- The electromagnetic spectrum
- The equator and hemispheres
- The heart
- The human body
- The immune system
- The Industrial Revolution
- The internet
- The Maya
- The mole (amount of substance)
- The Moon
- The normal distribution
- The periodic table
- The Pomodoro technique
- The quadratic formula and the discriminant
- The Renaissance
- The River Nile
- The rock cycle
- The senses
- The sine rule and the cosine rule
- The solar system
- The Sun
- The water cycle
- Thesis statements
- Time zones
- Times tables
- Transformations: reflection, rotation and translation
- Tricky words
- Trigonometry
- Tsunamis
- Two-way tables
- Types of triangles